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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4ee143f99d2714c1a271b69ea64f8f14c0f26e0c5264e17c1a7f75ca0abc95e' 
  AND token = 'VAPLxEgdOt4sxCbUK51s5y38QbZx9lQg9rLDTPvgq18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}